function tab(tabNum, numTabs) {
	var i;
	var node;
	var link;
	for (i=1; i<=numTabs; i++) {
		node = document.getElementById("tab" + i);
		link = document.getElementById("tabLink" + i);
		if (i == tabNum) {
			// show the tab and link
			node.style.display = "";
			link.className = "selected";
		} else {
			//hide the tab and link
			node.style.display = "none";
			link.className = "";
		}
	}
	return false;

}